The Excursion

  

The Loess Plateau ,is the only accumulated plateau in the world. It is composed of hundred meters of loess, which is accumulated during the whole Quaternary and even in the Pliocene. The unique properties of loess, such as, homogeneously fine grain size, high porosity, and its softness, make it easy to plough and subject to erosion. The development of gully system produces diversity of loess landforms. But the heavy soil erosion has a great impact on the daily life of the local people. The basement of the Loess Plateau is Mesozoic and Tertiary basins. The red clay, found beneath loess layers and above bedrock, is called Hipparion Clay and is correlated with Pontian.

Luochuan Yuan Located at the south of loess plateau, including Luochuan and her adjacent areas. Luochuan was a roughly plain basin, so loess geological feature was able to be kept in successive deposits and formed the Loess Yuan at last. Yuan is plain on its surface with a slope of less than 5 degree, its body is longstrip-like with 300-1500m of different width at sides due to its geological extension and cutting at present. Luochuan Yuan remains the most intactive loess stratigraphy since the Quatemary period, therefore it's an ideal place to loess research.

Luochaun Location

Interbeded Soils in Loess :1、Paleosol--horizontal or oblique red strip in loess formed under the condition of moist and warm climate. 2、Calcareous concretion--scattered and irregular part on loess, connected plated-like part formed by carbonate at the bottom of paleosol layer.

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